._container_top {
    border: 1px solid red;
    position: relative;
}

._container_top_1 {
    border: 1px solid red;
    float: left;
    text-align: center;
    line-height: 230px;
    margin-top: 150px;
    margin-left: 210px;
    height: 230px;
    width: 200px;
    background-color: #999999;
    position: absolute;
}

._container_top_2 {
    border: 1px solid red;
    float: left;
    text-align: center;
    line-height: 230px;
    margin-top: 150px;
    margin-left: 576px;
    height: 230px;
    width: 200px;
    background-color: #999999;
    position: absolute;
}

._container_top_3 {
    border: 1px solid red;
    float: left;
    text-align: center;
    line-height: 230px;
    margin-top: 150px;
    margin-left: 938px;
    height: 230px;
    width: 200px;
    background-color: #999999;
    position: absolute;
}

._container_top-4 {
    position: absolute;
    margin-top: 380px;
    margin-left: 270px;
}
.container{
    width: 1200px;
    padding: 15px;
}
.btn-wrapper {
    width: 1200px;
    margin: 10px auto;
    background-color: #f5f5f5;
    padding: 8px 15px;
    list-style: none;
    border-radius: 4px
}
.box{
    float: right;
}
.demo{
    width: auto;
}